Young high-temperature granulites from the base of the crust in central Mexico

Hayob, Jodie L.; Essene, Eric J.; Ruíz, Joaquin; Ortega-Gutiérrez, Fernando; Aranda-Gómez, José Jorge

doi:10.1038/342265a0

Cited by 65 publications

(25 citation statements)

References 16 publications

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“…Feldspars are ubiquitous in UHT metamorphic rocks, not only orthogneisses but also paragneisses of the Napier Complex and they commonly show perthitic, antiperthitic, or mesoperthitic exsolution textures (e.g., Harley 1985;Sheraton et al 1987). Similar compositions of mesoperthitic feldspars representing >1000 °C also have been reported from high-temperature granulite xenoliths in central Mexico (Hayob et al 1989). Similar compositions of mesoperthitic feldspars representing >1000 °C also have been reported from high-temperature granulite xenoliths in central Mexico (Hayob et al 1989).…”

Section: Introductionsupporting

confidence: 56%

Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica

Hokada

2001

American Mineralogist

142

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Section: Introductionsupporting

confidence: 56%

Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica

Hokada

2001

American Mineralogist

142

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“…Characterising Earth's crust in terms of apparent thermal gradients is useful for appreciating that UHT metamorphism is probably occurring at depth in numerous parts of the modern/contemporary world (e.g. Sandiford and Powell, 1986a;Harley, 1989;Hayob et al, 1989;Hacker et al, 2000;Blackburn et al, 2011;Ortega-Gutiérrez et al, 2012), and that many regional lower grade, highgeothermal gradient terranes are likely to be underlain by UHT rocks. Therefore, our view of UHT metamorphism should not be restricted only to exhumed terranes.…”

Section: What Is Uht Crustal Metamorphism?mentioning

confidence: 99%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

349

285

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a b s t r a c tUltrahigh temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900 C. UHT crustal metamorphism is recognised in more than 50 localities globally in the metamorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes. UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine þ quartz, orthopyroxene þ sillimanite AE quartz and osumilite in MgeAlrich rock compositions, now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry. Significant progress in the understanding of regional UHT metamorphism in recent years includes: (1) development of a ferric iron activityecomposition thermodynamic model for sapphirine, allowing phase diagram calculations for oxidised rock compositions; (2) quantification of UHT conditions via trace element thermometry, with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon. Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling. In addition, the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon; (3) more fully recognising and utilising temperature-dependent thermal properties of the crust, and the possible range of heat sources causing metamorphism in geodynamic modelling studies; (4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile, unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions; (5) more strongly linking UePb geochronological data from zircon and monazite to PeT points or path segments through using Y þ REE partitioning between accessory and major phases, as well as phase diagrams incorporating Zr and REE; and (6) improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models. These models suggest that regional UHT metamorphism is, principally, geodynamically related to subduction, coupled with elevated crustal radiogenic heat generation rates.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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“…The lower crust is ma¢c in composition [42,43], contains high concentrations of radiogenic Os (40^100 ppt [39,41], unradiogenic Sr, and ONd [43,44] and low concentrations of Re. Re and Os concentrations and the 187 Os/ 188 Os of Mexican [39] and Australian [41] lower crustal xenoliths are remarkably similar.…”

Section: Assimilation Componentmentioning

confidence: 99%

Source contamination versus assimilation: an example from the Trans-Mexican Volcanic Arc

Chesley

Ruíz

Righter

et al. 2002

Earth and Planetary Science Letters

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Young high-temperature granulites from the base of the crust in central Mexico

Cited by 65 publications

References 16 publications

Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica

Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Source contamination versus assimilation: an example from the Trans-Mexican Volcanic Arc

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